酯化反应的方程式

反应方程式分别为：

CH3OH + HCOOH = HCOOCH3 + H2O;

CH3OH + CH3COOH = CH3COOCH3 + H2O;

CH3CH2OH + HCOOH = HCOOCH2CH3 + H2O;

CH3CH2OH + CH3COOH = CH3COOCH2CH3 + H2O;

反应条件均为浓H2SO4、△